“Cesium-137 in the air near the power plant will deposit on nearby pastures. This will be grazed by cows and the cesium-137 in their milk will eventually be consumed by children. If we allow the permitted level of cesium-137 concentration in the air for just one day, a child consuming one liter of milk every day will get a whole-body dose of seven rads as a consequence of just one day’s exposure.” http://www.ratical.org/radiation/CNR/PP/chp5.html#maxPermCon